Do I need to Worry about Wood Expansion? - Woodworking Talk - Woodworkers Forum
 
Thread Tools Display Modes
post #1 of 15 Old 11-08-2017, 02:53 AM Thread Starter
Member
 
Join Date: Jun 2011
Location: Northridge, CA
Posts: 40
View sailmike's Photo Album My Photos
Do I need to Worry about Wood Expansion?

I'm planning to buy a miter lock bit next week to make drawers and boxes. I have a book that explains how to setup and use this bit. My first project will be a simple box made out of 1/2" baltic birch plywood for my scrap wood. I'm wondering about the expansion and contraction of wood and when to worry about it. If I do need to worry about it, then how do I take it into account?
Attached Images
 
sailmike is offline  
Sponsored Links
Advertisement
 
post #2 of 15 Old 11-08-2017, 03:14 AM
Senior Member
 
allpurpose's Avatar
 
Join Date: Mar 2016
Posts: 1,677
View allpurpose's Photo Album My Photos
Kind of depends on what you're going to use the boxes for and where they'll be used, but just general box making expansion shouldn't be a huge problem if you're joints are good and tight and glued up and clamped up right.. Plywood is pretty stable stuff for the most part..
I've made a bunch of boxes with simple butt joints even and haven't had one fall apart yet. Generally speaking most wood glues tend to be stronger than the wood itself after it sets up and dries if you clamp it correctly..

I figured it's time to change my signature so hold your breath. This is it.
Impressive, huh?
Marty or Marty Farty if you feel mean.

Last edited by allpurpose; 11-08-2017 at 03:18 AM.
allpurpose is offline  
post #3 of 15 Old 11-08-2017, 06:47 AM
Village Idiot
 
epicfail48's Avatar
 
Join Date: Mar 2014
Location: Springfield MO
Posts: 4,941
View epicfail48's Photo Album My Photos
Worry about movement with plywood? No, you dont need to. Yes, plywood does technically move, but the amount is negligible and a complete non-issue for anything youll be making from wood.

Solid wood, however, moves, and pretty drastically depending on the species. When working with solid woods, you do need to consider that the pieces will expand and contract with changes in moisture content. How you take that into account depends on what youre bulding

I need cheaper hobby
etsy.com/shop/projectepicfail
epicfail48 is offline  
Sponsored Links
Advertisement
 
post #4 of 15 Old 11-08-2017, 06:57 AM
Senior Member
 
Join Date: Sep 2011
Posts: 26,064
View Steve Neul's Photo Album My Photos
You don't need to worry about wood movement. You need to worry about plywood ruining your new router bit. The glue lines on the veneers on plywood really wear badly on a router bit.
Steve Neul is offline  
post #5 of 15 Old 11-08-2017, 09:42 AM
Member
 
Join Date: Oct 2017
Posts: 32
View highfigh's Photo Album My Photos
Quote:
Originally Posted by sailmike View Post
I'm planning to buy a miter lock bit next week to make drawers and boxes. I have a book that explains how to setup and use this bit. My first project will be a simple box made out of 1/2" baltic birch plywood for my scrap wood. I'm wondering about the expansion and contraction of wood and when to worry about it. If I do need to worry about it, then how do I take it into account?
I would think about using this bit- it's less likely to cause the edge to rise and it's easier to set up.

https://www.homedepot.com/p/Diablo-1...CABEgL9ZvD_BwE

You can also use a table saw for these joints- the link shows how to do this and it's a time-proven method.

http://www.woodmagazine.com/woodwork...-drawer-joints

I built my kitchen cabinets and used Baltic Birch for the drawers and used a simple rabbet joint (with brad nails to hold them as they dried)- I built a mock-up before to test it and it was strong enough, assuming nobody slams the drawer shut- I didn't use soft stop slides.

My mechanic told me "I can't fix your brakes, so I made your horn louder".
highfigh is offline  
post #6 of 15 Old 11-08-2017, 05:58 PM Thread Starter
Member
 
Join Date: Jun 2011
Location: Northridge, CA
Posts: 40
View sailmike's Photo Album My Photos
Alright, suppose I was making a drawer with two or three different kinds of wood and that I lived in the Florida Keys. How would I make it then?
sailmike is offline  
post #7 of 15 Old 11-08-2017, 07:38 PM
Senior Member
 
Join Date: Jun 2016
Location: SW Florida
Posts: 242
View canarywood1's Photo Album My Photos
You would make it like any other drawer, wood movement is across the grain, very little with the grain so joints should stay tight if properly made, remember your using fairly narrow pieces of wood to begin with, so minimal movement will occur.
canarywood1 is offline  
post #8 of 15 Old 11-08-2017, 07:41 PM
Senior Member
 
Join Date: Sep 2011
Posts: 26,064
View Steve Neul's Photo Album My Photos
Quote:
Originally Posted by sailmike View Post
Alright, suppose I was making a drawer with two or three different kinds of wood and that I lived in the Florida Keys. How would I make it then?
Unless it's green wood you could make a drawer out of five different species of wood and it wouldn't matter even living in Florida. The only way you might have issues is if you moved from Florida to Arizona. Then after several months you might notice a side or back is sticking up 1/64".
Steve Neul is offline  
post #9 of 15 Old 11-09-2017, 02:10 AM Thread Starter
Member
 
Join Date: Jun 2011
Location: Northridge, CA
Posts: 40
View sailmike's Photo Album My Photos
Thanks everyone!

Steve, is there anything I can do to minimize the wear on router bits from plywood?
sailmike is offline  
post #10 of 15 Old 11-09-2017, 07:21 AM
Senior Member
 
Join Date: Sep 2011
Posts: 26,064
View Steve Neul's Photo Album My Photos
Quote:
Originally Posted by sailmike View Post
Thanks everyone!

Steve, is there anything I can do to minimize the wear on router bits from plywood?
No, it's like the glue line was a thin sheet of sheetmetal. Every place where there is a glue line it will cut a groove in the router bit. At one time I had a contract to cut out 15" round icecream parlor seats out of plywood and I attempted to cut them out with a pattern and a router bit. I think I was about to cut 20-25 seats out before I had to take the bit out and throw it away. I then bought a better quality bit and very soon it started doing the same thing so I quit and cut the seats with a bandsaw.
Steve Neul is offline  
post #11 of 15 Old 11-10-2017, 10:00 PM Thread Starter
Member
 
Join Date: Jun 2011
Location: Northridge, CA
Posts: 40
View sailmike's Photo Album My Photos
Woodworking is a hobby for me, so I won't be making dozens of items. With that in mind, should I get a cheap miter lock bit from Yonico, or go for a quality bit like Freud? Also, I forgot that I can cut a 45 degree bevel before using the miter lock bit.

Last edited by sailmike; 11-10-2017 at 11:47 PM.
sailmike is offline  
post #12 of 15 Old 11-11-2017, 08:53 AM
Member
 
Join Date: Oct 2017
Posts: 32
View highfigh's Photo Album My Photos
Quote:
Originally Posted by sailmike View Post
Woodworking is a hobby for me, so I won't be making dozens of items. With that in mind, should I get a cheap miter lock bit from Yonico, or go for a quality bit like Freud? Also, I forgot that I can cut a 45 degree bevel before using the miter lock bit.
There are many suppliers of bits- I have used bits from MLCS for a long time and they last a long time when I was working with a lot of MDF, particle board and plywood. Also, it's a good idea to find someone near you who sharpens things- it allows more cutting tools to be 'one time purchases'. Obviously, the cost of sharpening can't be so high that buying new is the better choice, but over time, it can save a lot.

My mechanic told me "I can't fix your brakes, so I made your horn louder".
highfigh is offline  
post #13 of 15 Old 11-11-2017, 09:08 AM
Senior Member
 
Join Date: Sep 2011
Posts: 26,064
View Steve Neul's Photo Album My Photos
Quote:
Originally Posted by sailmike View Post
Woodworking is a hobby for me, so I won't be making dozens of items. With that in mind, should I get a cheap miter lock bit from Yonico, or go for a quality bit like Freud? Also, I forgot that I can cut a 45 degree bevel before using the miter lock bit.
If you plan to use the miter lock bit on plywood get a cheap bit. A better quality bit won't last very much longer.
Steve Neul is offline  
post #14 of 15 Old 11-11-2017, 06:43 PM Thread Starter
Member
 
Join Date: Jun 2011
Location: Northridge, CA
Posts: 40
View sailmike's Photo Album My Photos
How do I find these router bit sharpening services?
sailmike is offline  
post #15 of 15 Old 11-11-2017, 07:05 PM
Senior Member
 
Join Date: Sep 2011
Posts: 26,064
View Steve Neul's Photo Album My Photos
Quote:
Originally Posted by sailmike View Post
How do I find these router bit sharpening services?
Usually if you have a saw sharpening service in your area they will also do router bits. Where I am it's a half day drive to drop stuff off to be sharpened and another half day to pick them up so I just buy new instead of sharpening.
Steve Neul is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Woodworking Talk - Woodworkers Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Help choosing wood and tools for air rifle stock Zebra General Woodworking Discussion 6 11-08-2017 10:46 AM
Wood expansion and contraction desk cck Design & Plans 18 03-03-2016 05:51 PM
Basic Techniques Wood Engraving purnomoadi General Woodworking Discussion 0 11-16-2015 01:43 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome